economy relies. we must strengthen recovery in the event of a biological attack, which is still the most worrying threat out there. we need to make sure that the public understands the nature of these threats and how it can help identify and respond to them. above all, it needs to understand how not to respond to them. when bad things happen, it's easy to react out of fear, emotion and anger. let's hope that in boston this week we begin to chart a different course. for more on this, you can read my column in a special edition of "time" magazine on the tragedy in boston. let's get started. >>> joining me now the man who runs the biggest police force in america and one of the country's best intelligence divisions, ray kelly, the commissioner of new york. what do you have to tell us in the aftermath of this? is there a heightened sense of danger? are you seeing threats proliferate? >> no, we haven't seen an increase in threats, but our operating assumption is that we're always at risk. we're a city that